# Motobatt MBT4BB · Motorcycle battery 12V 2.5Ah 40A

![Motobatt MBT4BB · Motorcycle battery 12V 2.5Ah 40A](https://bateriasonline.es/3214-home_default/motobatt-mbt4bb.jpg)

> Motobatt MBT4BB: 2.5 Ah motorcycle battery, 40 A (EN), 113×38×87 mm, AGM. Equivalent to Fulbat FT4B-BS.

**Category:** [Motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries) → [Motobatt](https://bateriasonline.es/en/motobatt-batteries)

- **Canonical URL**: https://bateriasonline.es/en/motobatt-mbt4bb
- **Language**: en
- **Brand**: Motobatt
- **Reference**: BOL-MOTOBATT-MBT4BB
- **MPN**: MBT4BB
- **Price**: 362,31 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Motobatt |
| Range | MOTOBATT QUADFLEX |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 2.5 Ah (C10) |
| Cold cranking amps (EN) | 40 A |
| Length | 113 mm |
| Width | 38 mm |
| Height | 87 mm |
| Weight | 1.05 kg |

## Quick description

The Motobatt MBT4BB is a motorcycle battery (AGM) with 12 V, 2.5 Ah and 40 A cold cranking current, measuring 113 × 38 × 87 mm.

## Description

## Who the Motobatt MBT4BB is for

The Motobatt MBT4BB is made for motorcycles, scooters and quads. With 2.5 Ah, the MBT4BB suits motorcycles and scooters that had a battery of that capacity.
At 2.5 Ah it is a small battery, typical of 50 to 125 cc scooters and light motorcycles. The MBT4BB belongs to the Motobatt MOTOBATT QUADFLEX range. [More Motobatt batteries](https://bateriasonline.es/en/motobatt-batteries)

## Equivalents and alternatives to the Motobatt MBT4BB

As the MBT4BB is an AGM battery, we only list other AGM batteries with its dimensions and polarity: neither an EFB nor a conventional battery can replace it.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Fulbat FT4B-BS | AGM | 2.4 Ah | 40 A | 113 × 38 × 85 |

## Motobatt MBT4BB vs MT4R: differences

How the MBT4BB compares with Motobatt batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Motobatt MBT4BB (this one) | 2.5 Ah | 40 A | 113 × 38 × 87 | 1.05 kg |
| Motobatt MT4R | 2.5 Ah | 45 A | 114 × 49 × 86 | 1.15 kg |

- Motobatt MT4R: the same capacity, 5 A more cranking power, a different case (114 × 49 × 86 mm).

## Check this before ordering the Motobatt MBT4BB

- Cold cranking: 40 A (EN), equal to or higher than the original.
- Capacity of the MBT4BB: 2.5 Ah; the same as your current battery or slightly more is fine.
- Measure the space: the MBT4BB takes up 113 × 38 × 87 mm.

## Frequently asked questions about the Motobatt MBT4BB

### Motobatt MBT4BB or MT4R?

Compared with the MBT4BB, the Motobatt MT4R has 5 A more cranking power. If your current battery says 45 A or more, choose the MT4R; if it says 40 A or less, the MBT4BB is enough. Mind the space: the MT4R measures 114 × 49 × 86 mm.

### How much does the Motobatt MBT4BB weigh?

The MBT4BB weighs 1.05 kg. For reference, the Motobatt MT4R (2.5 Ah) weighs 1.15 kg.

### Which battery is equivalent to the Motobatt MBT4BB?

Only other AGM batteries with its dimensions and polarity: Fulbat FT4B-BS. Neither an EFB nor a conventional battery replaces the MBT4BB.

### Which charger does the Motobatt MBT4BB need?

A charger with an AGM mode that limits voltage to about 14.4-14.7 V. Never an old unregulated charger: overcharging dries out an AGM beyond repair.

## Inside the MBT4BB: AGM technology

Inside, the MBT4BB has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Keep comparing: alternatives to the MBT4BB

- [More motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [The whole Motobatt range](https://bateriasonline.es/en/motobatt-batteries)
- [Motobatt mb2.5u](https://bateriasonline.es/en/motobatt-mb2-5u) · 2.5 Ah, 80×70×105 mm

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*bateriasonline.es — Batteries and accessories · 2026-11-10*